Hi I need help on these 2 questions, I have no clue what to do.
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1) Let O be the center of the circle. Then the triangle ODA and ODC are congruent (because OD=OD, OA=OC and angles ODA and ODC are right). Therefore AD=DC. Then the height BD is also median and that happens in an isosceles triangle.
2) AC also bisects the arc BD. Then But
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